| Medazio Solutions Ltd | Administrative & support | 2021 |
| Medbe Affairs Investment Limited | Administrative & support | 2015 |
| Medburger Limited | Hospitality | 2026 |
| Medcare Investment Ltd | Manufacturing | 2024 |
| Medcore Limited | Professional & scientific | 2018 |
| Medcore Properties Limited | Real estate | 2025 |
| Meddalwedd AM Byth Ltd | Information & communication | 2026 |
| Meddev QA Ltd | Professional & scientific | 2010 |
| Medea - Medical Education Academy Limited | Education | 2022 |
| Medelicious Limited | Arts & recreation | 2019 |
| MEDENTBRITAIN1 Ltd | Wholesale & retail | 2014 |
| Medentisee Limited | Education | 2025 |
| Medi Saver Philippines Ltd | Professional & scientific | 2020 |
| Medi-Life Services Ltd | Health & social care | 2025 |
| Media Academy Cymru Ltd | Education | 2019 |
| Media Atom Ltd | Information & communication | 2017 |
| Media Care Ltd | Information & communication | 2023 |
| Media Career Advice Limited | Education | 2021 |
| Media Circus Partnerships Ltd | Professional & scientific | 2020 |
| Media Creative Services Limited | Professional & scientific | 2026 |
| Media Development Consultants Ltd | Arts & recreation | 2010 |
| Media Fidelis Ltd | Information & communication | 2025 |
| Media for Law Limited | Professional & scientific | 2013 |
| Media for Schools Ltd | Education | 2023 |
| Media Galaxy Ltd | Information & communication | 2022 |
| Media Investments Ltd | Information & communication | 2024 |
| Media Key AI Ltd | Wholesale & retail | 2025 |
| Media Leaders Limited | Information & communication | 2009 |
| Media Motors Limited | Information & communication | 2014 |
| Media Office Ltd. | Construction | 1998 |
| Media Stori Ltd | Professional & scientific | 2026 |
| Media Techly Ltd | Professional & scientific | 2022 |
| Media Training Station Community Interest Company | Education | 2011 |
| Media Transcript Services Ltd | Manufacturing | 2003 |
| Media Ultra Ltd | Professional & scientific | 2021 |
| MEDIA4LOOR Ltd | Professional & scientific | 2020 |
| Mediacloud Limited | Information & communication | 2025 |
| Mediaeyedigital Ltd | Information & communication | 2015 |
| Medianek Digital Ltd | Wholesale & retail | 2025 |
| Mediaology Limited | Professional & scientific | 2003 |
| Mediatext Limited | Information & communication | 2006 |
| Mediation Matters Limited | Professional & scientific | 2012 |
| Mediaway Technologies Ltd | Wholesale & retail | 2020 |
| Medibook Platform Ltd | Administrative & support | 2024 |
| Medibook Wellness Ltd | Professional & scientific | 2025 |
| Medical and Aesthetics Limited | Health & social care | 2014 |
| Medical and Educational Academy Limited | Professional & scientific | 2016 |
| Medical Consultancy Limited | Health & social care | 2003 |
| Medical Device Consulting Limited | Professional & scientific | 2024 |
| Medical Diagnostics (Cardiff) Limited | Health & social care | 2018 |
| Medical Emergency Response and Training Services Ltd | Professional & scientific | 2019 |
| Medical Ethics UK Limited | Manufacturing | 2017 |
| Medical Facilities Management Limited | Administrative & support | 2020 |
| Medical Logistics Solutions Ltd | Professional & scientific | 2024 |
| Medical Massage & Detox Ltd | Other services | 2021 |
| Medical Star Ltd | Information & communication | 2021 |
| Medical Systems Ltd | Information & communication | 2020 |
| Medicase Limited | Health & social care | 2008 |
| Medice Osteopathy Ltd | Health & social care | 2017 |
| Medicjob Ltd | Health & social care | 2018 |
| Medico 360 Limited | Professional & scientific | 2008 |
| Medico With Legal Solutions Ltd | Health & social care | 2022 |
| Medico-Legal Services (Wales) Limited | Health & social care | 2007 |
| Medicore Holdings Ltd | Financial services | 2021 |
| Medics SA Ltd | Health & social care | 2016 |
| Medicsol Limited | Health & social care | 2024 |
| Medicspro Key Services Ltd | Administrative & support | 2024 |
| Medicus First Response Training Ltd | Education | 2017 |
| Medidata Exchange Limited | Information & communication | 2015 |
| Medievalcastle Ltd | Wholesale & retail | 2025 |
| Medievalera Ltd | Wholesale & retail | 2025 |
| Medievalhistory Ltd | Wholesale & retail | 2025 |
| Medievalsahoo Ltd | Wholesale & retail | 2025 |
| Medievaltames Ltd | Wholesale & retail | 2025 |
| Medina Properties Haven Ltd | Households | 2025 |
| Medinfomatics Ltd | Information & communication | 2013 |
| Mediovista Limited | Other services | 2017 |
| Medipen Ltd | Manufacturing | 2015 |
| Mediqlasers DCF Europe Ltd | Wholesale & retail | 2022 |
| Mediskin Rejuvenate Clinic Ltd | Health & social care | 2023 |
| Mediterranea Restaurant Limited | Hospitality | 2018 |
| Mediterraneo Corporate Ltd | Financial services | 2019 |
| Meditrinaworld Ltd | Wholesale & retail | 2025 |
| Medium BOY Productions Ltd | Information & communication | 2026 |
| Mediwales Limited | Other services | 2005 |
| Medlap Limited | Health & social care | 2012 |
| Medlock Canteen Ltd | Hospitality | 2023 |
| Mednito Ltd | Information & communication | 2025 |
| Mednova Limited | Real estate | 2024 |
| Medosarl Ltd | Other services | 2025 |
| Medrecruiter Limited | Administrative & support | 2023 |
| Medscare Pharma (UK) Ltd | Manufacturing | 2020 |
| Medsec Services Limited | Administrative & support | 2025 |
| Medspa Pro Ltd | Health & social care | 2013 |
| Medtec Health Ltd | Wholesale & retail | 2026 |
| Medua Consultants Ltd. | Information & communication | 2019 |
| Meduk London Ltd | Wholesale & retail | 2019 |
| Medusa Alto Limited | Information & communication | 2021 |
| Medusa Processing Limited | Wholesale & retail | 2025 |
| Medwicki Specialty Fertilizers Limited | Manufacturing | 2025 |